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It sounds like you might not have installed the drill motor correctly.
There are two locating holes on the front face of the motor housing. It is important that these two holes line up with two pins projecting out of the face of the drill gearbox. This keeps the motor from rotating back and forth and slamming into the pins when the gearbox is shifted from forward to reverse. This rotating motion may be what you are hearing as a snapping noise.
If you do not have the pins inserted into the holes, the rotating motor will eventually break the pins off, causing the motor to spin around freely until the wires twist themselves into a knot, pulling them off the solder connections and shorting them out, causing sparks, smoke, and a popping of your circuit breaker.
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